Module: Recursive Upward Processing
(c) 2001 by O.Conrad
Menu: Terrain Analysis > Hydrology > Catchment Area
Description
Recursive upward processing of cells for calculation of flow accumulation and related parameters. This set of algorithms processes recursively all upwards connected cells until each cell of the DEM has been processed.

References:

Deterministic 8
- O'Callaghan, J.F. / Mark, D.M. (1984):
'The extraction of drainage networks from digital elevation data',
Computer Vision, Graphics and Image Processing, 28:323-344

Rho 8:
- Fairfield, J. / Leymarie, P. (1991):
'Drainage networks from grid digital elevation models',
Water Resources Research, 27:709-717

Deterministic Infinity:
- Tarboton, D.G. (1997):
'A new method for the determination of flow directions and upslope areas in grid digital elevation models',
Water Ressources Research, Vol.33, No.2, p.309-319

Multiple Flow Direction:
- Freeman, G.T. (1991):
'Calculating catchment area with divergent flow based on a regular grid',
Computers and Geosciences, 17:413-22

- Quinn, P.F. / Beven, K.J. / Chevallier, P. / Planchon, O. (1991):
'The prediction of hillslope flow paths for distributed hydrological modelling using digital terrain models',
Hydrological Processes, 5:59-79


Parameters
NameTypeIdentifierDescriptionConstraints
Input
Elevation Grid (input)ELEVATION
Sink Routes (*)Grid (optional input)SINKROUTE
Weight (*)Grid (optional input)WEIGHT
Target Areas (*)Grid (optional input)TARGETS
Output
Catchment AreaGrid (output)CAREA
Catchment Height (*)Grid (optional output)CHEIGHT
Catchment Slope (*)Grid (optional output)CSLOPE
Flow Path Length (*)Grid (optional output)FLOWLEN
Options
StepIntegerSTEPMinimum: 1.000000
MethodChoiceMethodAvailable Choices:
[0] Deterministic 8
[1] Rho 8
[2] Deterministic Infinity
[3] Multiple Flow Direction
ConvergenceFloating pointCONVERGENCEConvergence factor for Multiple Flow Direction Algorithm (Freeman 1991)
(*) optional